Cable test function Operation method: Long UNIT key for 3 seconds to open RJ45 test mode, then to close RJ45 test mode High quality head Penetrating farther, longer life. LED lighting features for dark work environment Can choose 6 kinds of wavelength:850nm.1300nm.1310nm.1490nm.1550nm.1625nm. Support three kinds of interface:FC .SC , Outgoing maintenance only one machine Function upgrade Optical Power Meter + Visual Fault Locator + Network Cable Test DIY self-calibration According to the actual test needs self-test parameters At the same time the λ + REF + UNIT button,enter the user mode,the screen displays the letter "CAL" the "REF" and "UNIT" keys at the same time to restore the power meter to the factory state Button UNIT,reducing 0.05dB the power button.Save REF + UNIT:restore factory settings the key λ to switch the wavelength REF,increase 0.05dB Set the current test result as a reference value,make relative power measurement,the display show the set DBM Detector type:InGaAs Measuring range:-70 to +3 Uncertainty:± 5% Display resolution:linear display,0.1% logarithmic display:0.01dBm Red working wavelength:650nm Red power:more than 5mW Operating temperature:-10 ~+60 ℃ Storage temperature:-25 ~+70 ℃ Automatic shutdown time:10min Battery continuous working hours (h):more than equal 48 Product Size:118 x 68 x 30mm Power:1.5VAAA x 2(Not included) colour:yellow Material:plastic Package Contents: 2 x Optical Fiber Tester 2 x network cable port Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.